lowgasm - IF you used Windows Explorer to delete the songs, you may have deleted the music DB file along with it - attempt a Repair in Philips Device Manager and see if it will sync after you are done. If Repair fails, that player is toast - get an in-warranty replacement from Philips.

brandon - The songs that you are playing are either in AAC (iTunes) format - which is not supported by the player - or they are DRM-encrypted. If you really do have an SA6045, the player can definitely handle DRM encrypted-WMA's. If you have a newer Philips - different model # - then the player may not support DRM-encrypted files. The best thing to do is to download songs (or convert songs from CD as the other helper suggested) that are in pure mp3 format. Examples of services that do this are Rhapsody's Mp3-only Subscription (other Rhapsody subscriptions are DRM-encrypted, which will not work); or Limewire (make sure the format you are downloading is mp3 and not something else).-Tha Mp3 Doctor

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Related Questions:

MP3 players can only play music files in mp3 file format.
You can download mp3 music files onto your computer and then copy them to your MP3 player.
For CD disks you need to convert your CDs to mp3 music files onto yourcomputer or download them from the Internet and then copy them to your MP3player.You can do this using Windows Media player and Rip the CDs - Media Player willcreate a MP3 music file for each music track.Click on this link for instruction on converting music files to mp3 file format:-
http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

Delete from the Windows desktop if possible. Double click on My Computer. Double click on the icon of the Sansa. Go into the music folder and delete from there.

Or

Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.

You have to make sure that the device is on MSC mode...then make sure your device is plug in to the computer..Then go to programs - accesories - windows explorer, find the SanDisk in my computer, go to media, music and delete them from there.Either under sync pane in windows media player it will show your music when it's connected. just click the plus signs for what song you need to get rid of, right click and click delete.Hope this helpsIf you still not able to delete it let me know so I can have you try something else...P.S.Please rate accordingly...Thank You Computerrep

Through the software in the device options you can delete everything on your zune (same as a reformat on your computer harddrive) this should solve your problem for the most part... If not there is a keycode that will ERASE EVERYTHING including firmware so you can start fresh.. Just try the software method and see how it goes.